Method for manufacturing heat resisting member applicable to an exhaust gas guide assembly with improved heat resistance for vgs turbocharger
a technology of heat resistance and exhaust gas, applied in the direction of machines/engines, solid-state diffusion coating, transportation and packaging, etc., can solve the problems of difficult to obtain a shaped material having a near-net shape for the adjustable blade, difficult to produce an effect of the turbocharger, and its life or durability has a certain limit, so as to increase the density of the shaped material, reduce the porosity of the metal material obtained by metal injection molding, and achieve high output power
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embodiment 1
[0086]Embodiment 1 is an embodiment in which the presence of nonmetallic matter present in a heat resisting metal member is decreased and the size of nonmetallic matter is reduced. For this purpose, a method or process, such as calcium injection, a heating pressurization treatment, a pure oxygen blowing refining treatment or the like, is applied to the heat resisting metal member. More specifically, the manufacturing procedure is as follows.
(i) Decrease of Nonmetallic Inclusions in the Heat Resisting Metal Member
[0087]Calcium injection during a refining process decreases generation of nonmetallic inclusions, i.e. oxides (type B and type C inclusions) as well as sulfides (type A inclusions) by discharging sulfur, silicon, aluminum and the like as calcium compounds. Furthermore, by a pure oxygen blowing refining treatment, nonmetallic inclusions of type B and type C are decreased by discharging oxides as slag.
(ii) Reduction of the Size of Nonmetallic Inclusions in the Heat resisting M...
embodiment 2
[0091]Embodiment 2 is an embodiment in which the heat resisting member (alloy) is manufactured according to the common procedure. Three examples embodied are shown in Table 1.
[0092]The reason for limiting the amount of each component in the alloy is as follows.
[0093]C of not more than 0.05% is to reduce sensitization susceptibility.
[0094]Mn of not less than 1% is to delay generation of a a phase.
[0095]Ni of not less than 15% is to increase free energy for generating the a phase.
[0096]Cr of not more than 30% is to increase free energy for generating the a phase.
[0097]Ti of not less than 0.1% is to generate a γ′ phase.
[0098]Al of not less than 0.1% is to generate the γ′ phase.
[0099]Ce or La of not less than 0.05% is to suppress generation of an a phase.
(i) Manufacture of the Exhaust Gas Guide Assembly
[0100]A basic material is manufactured by executing to it predetermined control of the above ingredients in the purifying process in a converter, thereafter, through the ordinary processe...
embodiment 3
[0106]Embodiment 3 is an embodiment and the alloy of this embodiment is manufactured according to the common procedure. Three examples embodied are shown in Table 4.
[0107]The reason for limiting the amount of each component in the alloy is as follows.
[0108]W of not less than 0.3% is to cause tempering secondary hardening to occur effectively and at a high temperature.
[0109]V of not less than 1.0% is to cause tempering secondary hardening to occur effectively and at a high temperature.
[0110]Mo of not less than 1.0% is to cause tempering secondary hardening to occur effectively and at a high temperature.
[0111]Hf of not less than 0.5% is to cause tempering secondary hardening to occur effectively and at a high temperature.
(i) Manufacture of the Exhaust Gas Guide Assembly
[0112]A stainless steel raw material is manufactured by controlling the composition in a refining process in a converter and further improving the accuracy of the composition in a secondary refining process, thereafter,...
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Abstract
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